/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// host.c -- coordinates spawning and killing of local servers

#include "quakedef.h"

/*

A server can allways be started, even if the system started out as a client
to a remote system.

A client can NOT be started if the system started as a dedicated server.

Memory is cleared / released when a server or client begins, not when they end.

*/

quakeparms_t host_parms;

qboolean	host_initialized;		// true if into command execution

double		host_frametime;
double		host_time;
double		realtime;				// without any filtering or bounding
double		oldrealtime;			// last frame run
int			host_framecount;

int			host_hunklevel;

int			minimum_memory;

client_t	*host_client;			// current client

jmp_buf 	host_abortserver;

byte		*host_basepal;
byte		*host_colormap;

cvar_t	host_framerate = {"host_framerate","0"};	// set for slow motion
cvar_t	host_speeds = {"host_speeds","0"};			// set for running times

cvar_t	sys_ticrate = {"sys_ticrate","0.05"};
cvar_t	serverprofile = {"serverprofile","0"};

cvar_t	fraglimit = {"fraglimit","0",false,true};
cvar_t	timelimit = {"timelimit","0",false,true};
cvar_t	teamplay = {"teamplay","0",false,true};

cvar_t	samelevel = {"samelevel","0"};
cvar_t	noexit = {"noexit","0",false,true};
cvar_t	developer = {"developer","0"};

cvar_t	skill = {"skill","1"};						// 0 - 3
cvar_t	deathmatch = {"deathmatch","0"};			// 0, 1, or 2
cvar_t	coop = {"coop","0"};			// 0 or 1

cvar_t	pausable = {"pausable","1"};
cvar_t	pausedemo = {"pausedemo","0"};//Pause Demo - Eradicator

cvar_t	maxfps = {"maxfps", "120", true};

cvar_t	timescalecvar = {"timescale","1"};//Timescale - Eradicator

cvar_t	temp1 = {"temp1","0"};

int			fps_count;

/*
================
Host_EndGame
================
*/
void Host_EndGame (char *message, ...)
{
    va_list		argptr;
    char		string[1024];

    va_start (argptr,message);
    va_vsnprintf (string, sizeof(string), message, argptr);
    va_end (argptr);
    Con_DPrintf ("Host_EndGame: %s\n",string);

    if (sv.active)
    {
        Host_ShutdownServer (false);
    }

    if (cls.state == ca_dedicated)
    {
        Sys_Error ("Host_EndGame: %s\n",string);	// dedicated servers exit
    }

    if (cls.demonum != -1)
    {
        CL_NextDemo ();
    }
    else
    {
        CL_Disconnect ();
    }
    longjmp (host_abortserver, 1);
}

/*
================
Host_Error

This shuts down both the client and server
================
*/
void Host_Error (char *error, ...)
{
    va_list		argptr;
    char		string[1024];
    static	qboolean inerror = false;

    if (inerror)
    {
        Sys_Error ("Host_Error: recursively entered\n");
    }
    inerror = true;

    SCR_EndLoadingPlaque ();		// reenable screen updates

    va_start (argptr,error);
    va_vsnprintf (string, sizeof(string), error, argptr);
    va_end (argptr);

    Con_Printf ("Host_Error: %s\n",string);

    if (sv.active)
    {
        Host_ShutdownServer (false);
    }

    if (cls.state == ca_dedicated)
    {
        Sys_Error ("Host_Error: %s\n",string);	// dedicated servers exit
    }
    CL_Disconnect ();
    cls.demonum = -1;

    inerror = false;

    longjmp (host_abortserver, 1);
}

/*
================
Host_FindMaxClients
================
*/
void	Host_FindMaxClients (void)
{
    int		i;

    svs.maxclients = 1;

    i = COM_CheckParm ("-dedicated");

    if (i)
    {
        cls.state = ca_dedicated;

        if (i != (com_argc - 1))
        {
            svs.maxclients = Q_atoi (com_argv[i+1]);
        }
        else
        {
            svs.maxclients = 8;
        }
    }
    else
    {
        cls.state = ca_disconnected;
    }
    i = COM_CheckParm ("-listen");

    if (i)
    {
        if (cls.state == ca_dedicated)
        {
            Sys_Error ("Only one of -dedicated or -listen can be specified");
        }

        if (i != (com_argc - 1))
        {
            svs.maxclients = Q_atoi (com_argv[i+1]);
        }
        else
        {
            svs.maxclients = 8;
        }
    }

    if (svs.maxclients < 1)
    {
        svs.maxclients = 8;
    }
    else if (svs.maxclients > MAX_SCOREBOARD)
    {
        svs.maxclients = MAX_SCOREBOARD;
    }
    svs.maxclientslimit = svs.maxclients;

    if (svs.maxclientslimit < 4)
    {
        svs.maxclientslimit = 4;
    }
    svs.clients = Hunk_AllocName (svs.maxclientslimit*sizeof(client_t), "clients");

    if (svs.maxclients > 1)
    {
        Cvar_SetValue ("deathmatch", 1.0);
    }
    else
    {
        Cvar_SetValue ("deathmatch", 0.0);
    }
}


/*
=======================
Host_InitLocal
======================
*/
void Host_InitLocal (void)
{
    Host_InitCommands ();

    Cvar_RegisterVariable (&host_framerate, NULL);
    Cvar_RegisterVariable (&host_speeds, NULL);

    Cvar_RegisterVariable (&sys_ticrate, NULL);
    Cvar_RegisterVariable (&serverprofile, NULL);

    Cvar_RegisterVariable (&fraglimit, NULL);
    Cvar_RegisterVariable (&timelimit, NULL);
    Cvar_RegisterVariable (&teamplay, NULL);
    Cvar_RegisterVariable (&samelevel, NULL);
    Cvar_RegisterVariable (&noexit, NULL);
    Cvar_RegisterVariable (&skill, NULL);
    Cvar_RegisterVariable (&developer, NULL);
    Cvar_RegisterVariable (&deathmatch, NULL);
    Cvar_RegisterVariable (&coop, NULL);

    Cvar_RegisterVariable (&pausable, NULL);
    Cvar_RegisterVariable (&timescalecvar, NULL); //Timesclae - Eradicator
    Cvar_RegisterVariable (&maxfps, NULL);
    Cvar_RegisterVariable (&temp1, NULL);

    Host_FindMaxClients ();

    host_time = 1.0;		// so a think at time 0 won't get called
}


/*
===============
Host_WriteConfiguration

Writes key bindings and archived cvars to config.cfg
===============
*/
void Host_WriteConfiguration (void)
{
    FILE	*f;

// dedicated servers initialize the host but don't parse and set the
// config.cfg cvars
    if (host_initialized & !isDedicated)
    {
        f = fopen (va("%s/config.cfg",com_gamedir), "w");

        if (!f)
        {
            Con_Printf ("Couldn't write config.cfg.\n");
            return;
        }
        Key_WriteBindings (f);
        Cvar_WriteVariables (f);

        fclose (f);
    }
}


/*
=================
SV_ClientPrintf

Sends text across to be displayed
FIXME: make this just a stuffed echo?
=================
*/
void SV_ClientPrintf (char *fmt, ...)
{
    va_list		argptr;
    char		string[1024];

    va_start (argptr,fmt);
    va_vsnprintf (string, sizeof(string), fmt, argptr);
    va_end (argptr);

    MSG_WriteByte (&host_client->message, svc_print);
    MSG_WriteString (&host_client->message, string);
}

/*
=================
SV_BroadcastPrintf

Sends text to all active clients
=================
*/
void SV_BroadcastPrintf (char *fmt, ...)
{
    va_list		argptr;
    char		string[1024];
    int			i;

    va_start (argptr,fmt);
    va_vsnprintf (string, sizeof(string), fmt, argptr);
    va_end (argptr);

    for (i=0 ; i<svs.maxclients ; i++)
    {
        if (svs.clients[i].active && svs.clients[i].spawned)
        {
            MSG_WriteByte (&svs.clients[i].message, svc_print);
            MSG_WriteString (&svs.clients[i].message, string);
        }
    }
}

/*
=================
Host_ClientCommands

Send text over to the client to be executed
=================
*/
void Host_ClientCommands (char *fmt, ...)
{
    va_list		argptr;
    char		string[1024];

    va_start (argptr,fmt);
    va_vsnprintf (string, sizeof(string), fmt, argptr);
    va_end (argptr);

    MSG_WriteByte (&host_client->message, svc_stufftext);
    MSG_WriteString (&host_client->message, string);
}

/*
=====================
SV_DropClient

Called when the player is getting totally kicked off the host
if (crash = true), don't bother sending signofs
=====================
*/
void SV_DropClient (qboolean crash)
{
    int		saveSelf;
    int		i;
    client_t *client;

    if (!crash)
    {
        // send any final messages (don't check for errors)
        if (NET_CanSendMessage (host_client->netconnection))
        {
            MSG_WriteByte (&host_client->message, svc_disconnect);
            NET_SendMessage (host_client->netconnection, &host_client->message);
        }

        if (host_client->edict && host_client->spawned)
        {
            // call the prog function for removing a client
            // this will set the body to a dead frame, among other things
            saveSelf = pr_global_struct->self;
            pr_global_struct->self = EDICT_TO_PROG(host_client->edict);
            PR_ExecuteProgram (pr_global_struct->ClientDisconnect);
            pr_global_struct->self = saveSelf;
        }
        Sys_Printf ("Client %s removed\n",host_client->name);
    }

// break the net connection
    NET_Close (host_client->netconnection);
    host_client->netconnection = NULL;

// free the client (the body stays around)
    host_client->active = false;
    host_client->name[0] = 0;
    host_client->old_frags = -999999;
    net_activeconnections--;

// send notification to all clients
    for (i=0, client = svs.clients ; i<svs.maxclients ; i++, client++)
    {
        if (!client->active)
            continue;
        MSG_WriteByte (&client->message, svc_updatename);
        MSG_WriteByte (&client->message, host_client - svs.clients);
        MSG_WriteString (&client->message, "");
        MSG_WriteByte (&client->message, svc_updatefrags);
        MSG_WriteByte (&client->message, host_client - svs.clients);
        MSG_WriteShort (&client->message, 0);
        MSG_WriteByte (&client->message, svc_updatecolors);
        MSG_WriteByte (&client->message, host_client - svs.clients);
        MSG_WriteByte (&client->message, 0);
    }
}

/*
==================
Host_ShutdownServer

This only happens at the end of a game, not between levels
==================
*/
void Host_ShutdownServer(qboolean crash)
{
    int		    i;
    int		    count;
    sizebuf_t	buf;
    char		message[4];
    double	    start;

    if (!sv.active) return;

    sv.active = false;

// stop all client sounds immediately
    if (cls.state == ca_connected)
    {
        CL_Disconnect ();
    }

// flush any pending messages - like the score!!!
    start = Sys_FloatTime();

    do
    {
        count = 0;

        for (i=0, host_client = svs.clients ; i<svs.maxclients ; i++, host_client++)
        {
            if (host_client->active && host_client->message.cursize)
            {
                if (NET_CanSendMessage (host_client->netconnection))
                {
                    NET_SendMessage(host_client->netconnection, &host_client->message);
                    SZ_Clear (&host_client->message);
                }
                else
                {
                    NET_GetMessage(host_client->netconnection);
                    count++;
                }
            }
        }

        if ((Sys_FloatTime() - start) > 3.0) break;
    } while (count);

// make sure all the clients know we're disconnecting
    buf.data = (byte *) message;
    buf.maxsize = 4;
    buf.cursize = 0;
    MSG_WriteByte(&buf, svc_disconnect);
    count = NET_SendToAll(&buf, 5);

    if (count)
    {
        Con_Printf("Host_ShutdownServer: NET_SendToAll failed for %u clients\n", count);
    }

    for (i=0, host_client = svs.clients ; i<svs.maxclients ; i++, host_client++)
    {
        if (host_client->active)
        {
            SV_DropClient(crash);
        }
    }

//
// clear structures
//
    memset (&sv, 0, sizeof(sv));
    memset (svs.clients, 0, svs.maxclientslimit*sizeof(client_t));
}


/*
================
Host_ClearMemory

This clears all the memory used by both the client and server, but does
not reinitialize anything.
================
*/
void Host_ClearMemory (void)
{
    Con_DPrintf ("Clearing memory\n");

    Mod_ClearAll ();

    if (host_hunklevel)
    {
        Hunk_FreeToLowMark (host_hunklevel);
    }
    cls.signon = 0;

    memset (&sv, 0, sizeof(sv));
    memset (&cl, 0, sizeof(cl));
}


//============================================================================


/*
===================
Host_FilterTime

Returns false if the time is too short to run a frame
===================
*/
qboolean Host_FilterTime (float time)
{
    realtime += time;

    if (maxfps.value < 1)
    {
        Cvar_SetValue("maxfps", 120); //Max FPS - Eradicator
    }

    if (!cls.timedemo && realtime - oldrealtime < 1.0 / maxfps.value)
    {
        return false;		// framerate is too high
    }

    if (timescalecvar.value == 1) //Timescale - Eradicator
    {
        host_frametime = (realtime - oldrealtime);
    }
    else
    {
        host_frametime = (realtime - oldrealtime) * timescalecvar.value;
    }
    oldrealtime = realtime;

    if (host_framerate.value > 0)
    {
        host_frametime = host_framerate.value;
    }
    else
    {
        // don't allow really long or short frames
        if (host_frametime > 0.1)
        {
            host_frametime = 0.1;
        }

        if (host_frametime < 0.001)
        {
            host_frametime = 0.001;
        }
    }
    return true;
}


/*
===================
Host_GetConsoleCommands

Add them exactly as if they had been typed at the console
===================
*/
void Host_GetConsoleCommands (void)
{
    char	*cmd;

    while (1)
    {
        cmd = Sys_ConsoleInput ();
        if (!cmd) break;
        Cbuf_AddText (cmd);
    }
}


/*
==================
Host_ServerFrame

==================
*/
#ifdef FPS_20

void _Host_ServerFrame (void)
{
// run the world state
    pr_global_struct->frametime = host_frametime;

// read client messages
    SV_RunClients ();

// move things around and think
// always pause in single player if in console or menus
    if (!sv.paused && (svs.maxclients > 1 || key_dest == key_game) )
        SV_Physics ();
}

void Host_ServerFrame (void)
{
    float	save_host_frametime;
    float	temp_host_frametime;

// run the world state
    pr_global_struct->frametime = host_frametime;

// set the time and clear the general datagram
    SV_ClearDatagram ();

// check for new clients
    SV_CheckForNewClients ();

    temp_host_frametime = save_host_frametime = host_frametime;
    while(temp_host_frametime > (1.0/72.0))
    {
        if (temp_host_frametime > 0.05)
            host_frametime = 0.05;
        else
            host_frametime = temp_host_frametime;
        temp_host_frametime -= host_frametime;
        _Host_ServerFrame ();
    }
    host_frametime = save_host_frametime;

// send all messages to the clients
    SV_SendClientMessages ();
}

#else

void Host_ServerFrame (void)
{
// run the world state
    pr_global_struct->frametime = host_frametime;

// set the time and clear the general datagram
    SV_ClearDatagram ();

// check for new clients
    SV_CheckForNewClients ();

// read client messages
    SV_RunClients ();

// move things around and think
// always pause in single player if in console or menus
    if (!sv.paused && (svs.maxclients > 1 || key_dest == key_game) )
        SV_Physics ();

// send all messages to the clients
    SV_SendClientMessages ();
}

#endif


/*
==================
Host_Frame

Runs all active servers
==================
*/
void _Host_Frame (float time)
{
    static double		time1 = 0;
    static double		time2 = 0;
    static double		time3 = 0;
    int			        pass1, pass2, pass3;

    if (setjmp (host_abortserver) )
        return;			// something bad happened, or the server disconnected

// keep the random time dependent
    rand ();

// decide the simulation time
    if (!Host_FilterTime (time))
        return;			// don't run too fast, or packets will flood out

// get new key events
    Sys_SendKeyEvents ();

// allow mice or other external controllers to add commands
    IN_Commands ();

// process console commands
    Cbuf_Execute ();

    NET_Poll();

// if running the server locally, make intentions now
    if (sv.active)
    {
        CL_SendCmd ();
    }

//-------------------
//
// server operations
//
//-------------------

// check for commands typed to the host
    Host_GetConsoleCommands ();

    if (sv.active)
    {
        Host_ServerFrame ();
    }

//-------------------
//
// client operations
//
//-------------------

// if running the server remotely, send intentions now after
// the incoming messages have been read
    if (!sv.active)
    {
        CL_SendCmd ();
    }
    host_time += host_frametime;

// fetch results from server
    if (cls.state == ca_connected)
    {
        CL_ReadFromServer ();
    }

// update video
    if (host_speeds.value)
    {
        time1 = Sys_FloatTime ();
    }
    SCR_UpdateScreen ();

    if (host_speeds.value)
    {
        time2 = Sys_FloatTime ();
    }

// update audio
    if (cls.signon == SIGNONS)
    {
        S_Update (r_origin, vpn, vright, vup);
        CL_DecayLights ();
    }
    else
    {
        S_Update (vec3_origin, vec3_origin, vec3_origin, vec3_origin);
    }
    CDAudio_Update();

    if (host_speeds.value)
    {
        pass1 = (time1 - time3)*1000;
        time3 = Sys_FloatTime ();
        pass2 = (time2 - time1)*1000;
        pass3 = (time3 - time2)*1000;
        Con_Printf ("%3i tot %3i server %3i gfx %3i snd\n", pass1 + pass2 + pass3, pass1, pass2, pass3);
    }
    host_framecount++;

//frame speed counter
    fps_count++;//muff

}

void Host_Frame (float time)
{
    double	        time1, time2;
    static double	timetotal;
    static int		timecount;
    int		        i, c, m;

    if (!serverprofile.value)
    {
        _Host_Frame (time);
        return;
    }
    time1 = Sys_FloatTime ();
    _Host_Frame (time);
    time2 = Sys_FloatTime ();

    timetotal += time2 - time1;
    timecount++;

    if (timecount < 1000) return;

    m = timetotal*1000/timecount;
    timecount = 0;
    timetotal = 0;
    c = 0;

    for (i=0 ; i<svs.maxclients ; i++)
    {
        if (svs.clients[i].active)
        {
            c++;
        }
    }
    Con_Printf ("serverprofile: %2i clients %2i msec\n",  c,  m);
}

//============================================================================

extern int vcrFile;
#define	VCR_SIGNATURE	0x56435231
void Host_InitVCR (quakeparms_t *parms)
{
    int		i, len, n;
    char	*p;

    if (COM_CheckParm("-playback"))
    {
        if (com_argc != 2)
        {
            Sys_Error("No other parameters allowed with -playback\n");
        }
        Sys_FileOpenRead("quake.vcr", &vcrFile);

        if (vcrFile == -1)
        {
            Sys_Error("playback file not found\n");
        }
        Sys_FileRead (vcrFile, &i, sizeof(int));

        if (i != VCR_SIGNATURE)
        {
            Sys_Error("Invalid signature in vcr file\n");
        }
        Sys_FileRead (vcrFile, &com_argc, sizeof(int));

        com_argv = malloc(com_argc * sizeof(char *));
        com_argv[0] = parms->argv[0];

        for (i = 0; i < com_argc; i++)
        {
            Sys_FileRead (vcrFile, &len, sizeof(int));
            p = malloc(len);
            Sys_FileRead (vcrFile, p, len);
            com_argv[i+1] = p;
        }
        com_argc++; /* add one for arg[0] */
        parms->argc = com_argc;
        parms->argv = com_argv;
    }

    if ( (n = COM_CheckParm("-record")) != 0)
    {
        vcrFile = Sys_FileOpenWrite("quake.vcr");

        i = VCR_SIGNATURE;
        Sys_FileWrite(vcrFile, &i, sizeof(int));

        i = com_argc - 1;
        Sys_FileWrite(vcrFile, &i, sizeof(int));

        for (i = 1; i < com_argc; i++)
        {
            if (i == n)
            {
                len = 10;
                Sys_FileWrite(vcrFile, &len, sizeof(int));
                Sys_FileWrite(vcrFile, "-playback", len);
                continue;
            }
            len = Q_strlen(com_argv[i]) + 1;
            Sys_FileWrite(vcrFile, &len, sizeof(int));
            Sys_FileWrite(vcrFile, com_argv[i], len);
        }
    }
}

/*
====================
Host_Init
====================
*/
void Host_Init (quakeparms_t *parms)
{

    if (standard_quake)
    {
        minimum_memory = MINIMUM_MEMORY;
    }
    else
    {
        minimum_memory = MINIMUM_MEMORY_LEVELPAK;
    }

    if (COM_CheckParm ("-minmemory"))
    {
        parms->memsize = minimum_memory;
    }
    host_parms = *parms;

    if (parms->memsize < minimum_memory)
    {
        Sys_Error ("Only %4.1f megs of memory available, can't execute game", parms->memsize / (float)0x100000);
    }
    com_argc = parms->argc;
    com_argv = parms->argv;

    Memory_Init (parms->membase, parms->memsize);
    Cbuf_Init ();
    Cmd_Init ();
    V_Init ();
    Chase_Init ();
    Host_InitVCR (parms);
    COM_Init (parms->basedir);
    Host_InitLocal ();
    W_LoadWadFile ("gfx.wad");
    Key_Init ();
    Con_Init ();
    M_Init ();
    PR_Init ();
    Mod_Init ();
    NET_Init ();
    SV_Init ();

    Con_Printf ("Exe: "__TIME__" "__DATE__"\n");
    Con_Printf ("Modified by Charles 'Pentagram' Hollemeersch\n");
    Con_Printf ("%4.1f megabyte heap\n",parms->memsize/ (1024*1024.0));

    R_InitTextures ();		// needed even for dedicated servers

    if (cls.state != ca_dedicated)
    {
        host_basepal = (byte *)COM_LoadHunkFile ("gfx/palette.lmp");

        if (!host_basepal)
        {
            Sys_Error ("Couldn't load gfx/palette.lmp");
        }
        host_colormap = (byte *)COM_LoadHunkFile ("gfx/colormap.lmp");

        if (!host_colormap)
        {
            Sys_Error ("Couldn't load gfx/colormap.lmp");
        }
        VID_Init (host_basepal);
        Draw_Init ();
        SCR_Init ();
        R_Init ();
        S_Init ();

        CDAudio_Init ();
        Sbar_Init ();
        CL_Init ();
#ifdef _WIN32 // on non win32, mouse comes before video for security reasons
        IN_Init ();
#endif
    }

    Cbuf_InsertText ("exec quake.rc\n");

    Hunk_AllocName (0, "-HOST_HUNKLEVEL-");
    host_hunklevel = Hunk_LowMark ();

    host_initialized = true;

    Sys_Printf ("========Quake Initialized=========\n");
}


/*
===============
Host_Shutdown

FIXME: this is a callback from Sys_Quit and Sys_Error.  It would be better
to run quit through here before the final handoff to the sys code.
===============
*/
void Host_Shutdown(void)
{
    static qboolean isdown = false;

    if (isdown)
    {
        printf ("recursive shutdown\n");
        return;
    }
    isdown = true;

// keep Con_Printf from trying to update the screen
    scr_disabled_for_loading = true;

    Host_WriteConfiguration ();
    CDAudio_Shutdown ();
    NET_Shutdown ();
    S_Shutdown();
    IN_Shutdown ();

    if (cls.state != ca_dedicated)
    {
        VID_Shutdown();
    }
}

